10. An arc of a circle measures 30°. If the radius of the circle is 5 cm, what is the length of the arc? A. 2.62 cm B. 2.3 cm C. 1.86 cm D. 1.5 cm 11. Which of the following describes a tangent to a circle? A. a line coplanar with the circle and intersects it in one and only one point B. a line that intersects a circle at exactly two points C. the region bounded by an arc of the circle and the two radii to the endpoints of the arc D. the region bounded by an arc and the segment joining its endpoints. 12. An arc of a circle measures 72°. If the radius of the circle is 6 cm, about how long is the arc? A. 1.884 cm C. 3.768 cm B. 2.4 cm D. 7. 54 cm 13. Cathy designed a pendant. It is a regular hexagon set in a circle. Suppose the opposite vertices are connected by line segments and meet at the center of the circle. What is the measure of each angle formed at the A. 22.5° С. 60° D. 72° В. 45°

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